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The Nature of Ion Conduction in Methylammonium Lead Iodide: A Multimethod Approach.


ABSTRACT: By applying a multitude of experimental techniques including 1 H, 14 N, 207 Pb NMR and 127 I NMR/NQR, tracer diffusion, reaction cell and doping experiments, as well as stoichiometric variation, conductivity, and polarization experiments, iodine ions are unambiguously shown to be the mobile species in CH3 NH3 PbI3 , with iodine vacancies shown to represent the mechanistic centers under equilibrium conditions. Pb2+ and CH3 NH3+ ions do not significantly contribute to the long range transport (upper limits for their contributions are given), whereby the latter exhibit substantial local motion. The decisive electronic contribution to the mixed conductivity in the experimental window stems from electron holes. As holes can be associated with iodine orbitals, local variations of the iodine stoichiometry may be fast and enable light effects on ion transport.

SUBMITTER: Senocrate A 

PROVIDER: S-EPMC5502889 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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The Nature of Ion Conduction in Methylammonium Lead Iodide: A Multimethod Approach.

Senocrate Alessandro A   Moudrakovski Igor I   Kim Gee Yeong GY   Yang Tae-Youl TY   Gregori Giuliano G   Grätzel Michael M   Maier Joachim J  

Angewandte Chemie (International ed. in English) 20170530 27


By applying a multitude of experimental techniques including <sup>1</sup> H, <sup>14</sup> N, <sup>207</sup> Pb NMR and <sup>127</sup> I NMR/NQR, tracer diffusion, reaction cell and doping experiments, as well as stoichiometric variation, conductivity, and polarization experiments, iodine ions are unambiguously shown to be the mobile species in CH<sub>3</sub> NH<sub>3</sub> PbI<sub>3</sub> , with iodine vacancies shown to represent the mechanistic centers under equilibrium conditions. Pb<sup>2+<  ...[more]

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